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Texas Instruments SN74ALS29827DWRG4
- Part No.:
- SN74ALS29827DWRG4
- Manufacturer:
- Texas Instruments
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74ALS29827DWRG4.pdf
- Description:
- IC BUF NON-INVERT 5.25V 24SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,081
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Product details
Overview
SN74ALS29827DWRG4 from Texas Instruments is a 10-bit non-inverting buffer/bus driver with dual 3-state enable inputs (OE1, OE2), designed for high-performance bus interfacing in wide data paths carrying parity. It operates at 4.75–5.25 V, delivers ±24 mA output drive, features pnp input structure to reduce DC loading, and maintains high-impedance state at power-up.
For engineers reviewing the SN74ALS29827DWRG4 datasheet, SN74ALS29827DWRG4 pinout, SN74ALS29827DWRG4 application, or SN74ALS29827DWRG4 equivalent, key selection criteria include its true-output logic, 24-pin SOIC (DW) package, 0°C to 70°C temperature range, and dual-NOR 3-state control architecture enabling flexible bus arbitration.
Technical Context
This device implements a dual-gated 3-state output control using a 2-input NOR logic: either OE1 or OE2 high forces all ten Y outputs into high-impedance. Its pnp-based input stage minimizes input current draw (IIL ≤ –0.1 mA, IIH ≤ 20 µA), reducing loading on upstream drivers. The data-flow-through pinout-inputs on one side (pins 1–11), outputs on the opposite (pins 13–24)-simplifies PCB routing in memory address or data bus applications.
Switching performance is specified at CL = 50 pF and CL = 300 pF loads: propagation delay (tPLH/tPHL) is 7–15 ns, while 3-state enable/disable times (tPZH/tPZL/tPHZ/tPLZ) range from 9 ns to 23 ns. Output voltage levels meet ALS family specs: VOH ≥ 2.0 V at –24 mA, VOL ≤ 0.5 V at 48 mA, ensuring robust noise margins in TTL-compatible systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Function | 10-bit non-inverting buffer with true outputs (SN74ALS29827) |
| Supply Voltage | 4.75 V to 5.25 V - ensures compatibility with standard 5-V TTL/ALS systems |
| Output Drive | IOH = –24 mA / IOL = 48 mA - sufficient to drive 10–15 TTL loads or heavy capacitive buses |
| Propagation Delay | tPLH/tPHL = 7 ns (CL = 50 pF) - supports >100 MHz bus operation in low-capacitance layouts |
| 3-State Enable Time | tPZH = 9 ns (CL = 5 pF) - enables fast bus turnaround in time-critical multiplexed systems |
| Operating Temperature | 0°C to 70°C - qualified for commercial-grade embedded and industrial control applications |
| Input Structure | pnp input stage - reduces input current (II ≤ 0.1 mA), minimizing loading on preceding logic stages |
Pinout & Package
SN74ALS29827DWRG4 is housed in a 24-pin SOIC (DW) package, 300-mil width, with gull-wing leads and RoHS-compliant NiPdAu finish. Pin 12 is GND; pin 13 is VCC. The layout follows a strict data-flow-through arrangement: all 10 inputs (A1–A10) occupy pins 1–11 (excluding pin 12), and all 10 outputs (Y1–Y10) occupy pins 13–24 (excluding pin 13).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OE1, OE2 | 3-State Enable Inputs | Active-high NOR gate: either high disables all outputs - enables independent bus segment control |
| A1–A10 | Data Inputs | True-buffered inputs with pnp structure - low DC loading and TTL-compatible thresholds (VIH = 2 V, VIL = 0.8 V) |
| Y1–Y10 | Buffered Outputs | 3-state CMOS-compatible outputs - drive buses or memory address registers with 24 mA sink/source capability |
| VCC (Pin 13) | Power Supply | +5 V supply rail - decoupling required within 1 cm due to 40 mA ICC max current draw |
| GND (Pin 12) | Ground Reference | Common return path for all I/O and internal logic - must be low-inductance connection to minimize switching noise |
Key Features
| Feature | Design Value |
|---|---|
| True-output logic | SN74ALS29827 provides non-inverted data path - eliminates need for external inversion in address/data forwarding |
| Dual 3-state enable | Independent OE1/OE2 inputs allow hierarchical bus arbitration - e.g., local vs. remote bus segments |
| Data-flow-through pinout | Inputs (1–11) and outputs (13–24) on opposite sides - enables straight-layer PCB routing with minimal trace crossovers |
| Power-up high-impedance | Outputs remain Hi-Z until both OE inputs stabilize - prevents bus contention during system reset or power sequencing |
| pnp input structure | Reduces input current to ≤0.1 mA - allows direct fanout to 20+ ALS gates without buffering |
Applications
| Memory Address Buffering | Parallel Bus Isolation |
|---|---|
Use Scenario: Buffering 10-bit CPU address lines driving multiple memory chips on a shared bus. IC Role / Device Role / Timing Role: Non-inverting address register buffer with 3-state control synchronized to memory select signals. Use Value: Prevents address bus contention during memory access arbitration; 7 ns propagation delay ensures setup/hold timing compliance at 20 MHz clock rates. | Use Scenario: Isolating two microprocessor subsystems sharing a common data bus via software-controlled enable signals. IC Role / Device Role / Timing Role: Bidirectional bus driver with dual OE inputs enabling selective subsystem access. Use Value: Enables clean bus handoff between master/slave processors; 9 ns tPZH guarantees sub-10 ns bus release for real-time inter-processor communication. |
| Parity Bus Interface | Legacy System Backplane Driver |
Use Scenario: Driving 10-bit parity check lines from a parity generator IC to multiple downstream error-detection units. IC Role / Device Role / Timing Role: High-drive buffer for parity signal distribution with noise-immune TTL-level outputs. Use Value: Delivers 48 mA sink current per output - sustains signal integrity across 15-cm backplane traces loaded with 50 pF capacitance. | Use Scenario: Replacing obsolete AM29827 in retrofitted industrial controllers requiring drop-in compatible bus drivers. IC Role / Device Role / Timing Role: Pin- and function-compatible replacement for AMD AM29827 in legacy 5-V backplane designs. Use Value: Matches AM29827's pinout, timing, and drive strength - requires no PCB or firmware changes in field-replacement scenarios. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 10-bit non-inverting bus driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ALS29827DW | Same die, identical electrical specs, identical DW package - differs only in part marking and packaging (tube vs. tape/reel) | No functional difference; used interchangeably in production where reel feed is not required | Select SN74ALS29827DW for manual assembly or low-volume prototyping where tube packaging is preferred |
| AM29827 | Functionally equivalent per TI documentation; same pinout, timing, and drive specs - manufactured by AMD, now obsolete | Legacy design-in only; no active manufacturing or long-term supply assurance | Choose SN74ALS29827DWRG4 for new designs requiring guaranteed availability and TI's full support lifecycle |
Compared with AM29827 and SN74ALS29827DW, SN74ALS29827DWRG4 offers identical functionality and pin compatibility but adds RoHS compliance, updated quality screening, and sustained production status - making it the recommended choice for new designs and obsolescence mitigation.
Availability
SN74ALS29827DWRG4 is available at Aetrix Electronics and suitable for memory address buffering, parallel bus isolation, and parity bus interface applications requiring stable component supply and long-term industrial availability.
Supply support for SN74ALS29827DWRG4 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and logic solutions, with over 90 years of innovation in industrial, automotive, and communications markets.
The SN74ALS29827DWRG4 belongs to TI's legacy ALS logic family, engineered for high-speed, low-power 5-V TTL-compatible bus interfacing in commercial-temperature embedded systems and industrial controllers.
FAQ
What logic function does the SN74ALS29827DWRG4 implement?
The SN74ALS29827DWRG4 implements a 10-bit non-inverting buffer with 3-state outputs. It passes A1–A10 inputs directly to Y1–Y10 outputs when enabled, and places all outputs in high-impedance state if either OE1 or OE2 is high. This matches the true-output behavior of the SN74ALS29827 variant - distinct from the inverted SN74ALS29828.
Is SN74ALS29827DWRG4 pin-compatible with AM29827?
Yes, SN74ALS29827DWRG4 is functionally and pin-compatible with AMD's AM29827, as confirmed in TI's SDAS095B datasheet. Both share identical 24-pin SOIC (DW) pinout, electrical specifications, and timing characteristics - enabling direct replacement in legacy AM29827-based designs without PCB modification.
What is the maximum output current rating for SN74ALS29827DWRG4?
The SN74ALS29827DWRG4 supports IOL = 48 mA (low-level output current) and IOH = –24 mA (high-level output current) under recommended operating conditions. These ratings ensure reliable drive capability for up to 15 standard TTL loads or heavily capacitive bus traces up to 300 pF.
Does SN74ALS29827DWRG4 support hot insertion or live bus swapping?
SN74ALS29827DWRG4 features a power-up high-impedance state and absolute maximum ratings that allow safe operation during hot insertion: inputs tolerate up to 5.5 V, disabled outputs withstand 5.5 V, and VCC can ramp independently. However, controlled enable sequencing via OE1/OE2 is recommended to prevent transient bus contention during live swap events.
What package type and lead finish does SN74ALS29827DWRG4 use?
SN74ALS29827DWRG4 uses a 24-pin SOIC (DW) package with NiPdAu (NIPDAU) lead finish, RoHS-compliant, and MSL Level-1 rating (unlimited floor life at ≤30°C/60% RH). The "RG4" suffix denotes tape-and-reel packaging (1000 units per reel), distinguishing it from tube-packaged variants like SN74ALS29827DW.
SN74ALS29827DWRG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ALS
- Package/Case:
- 24-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Logic Type:
- Buffer, Non-Inverting
- Number of Elements:
- 1
- Number of Bits per Element:
- 10
- Input Type:
- -
- Output Type:
- 3-State
- Current - Output High, Low:
- 24mA, 48mA
- Voltage - Supply:
- 4.75V ~ 5.25V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-SOIC
SN74ALS29827DWRG4 FAQ
1.How can I place an order for SN74ALS29827DWRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ALS29827DWRG4 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for SN74ALS29827DWRG4 reliable?
The price and inventory of SN74ALS29827DWRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ALS29827DWRG4 is usually 5 days.
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Once your SN74ALS29827DWRG4 order is processed, you will receive an email with the shipment details and tracking number.
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5.How can I obtain technical support or documentation for SN74ALS29827DWRG4?
For technical support, including SN74ALS29827DWRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ALS29827DWRG4 requirements.
6.How does Aetrix verify that SN74ALS29827DWRG4 is sourced from the original manufacturer or authorized distributors?
All SN74ALS29827DWRG4 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that SN74ALS29827DWRG4 meets industry standards.
7.What is the process for return or replacement of SN74ALS29827DWRG4?
All SN74ALS29827DWRG4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74ALS29827DWRG4, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The SN74ALS29827DWRG4 part is unused and in its original packaging.
Return procedure for SN74ALS29827DWRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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